<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="vue.js"></script>
</head>
<body>
    <div id="f">
        <p>请输入张三的成绩：<input  value="text" v-model="msg" ></p>
        <h2 v-if="msg<60" >张三成绩不及格</h2>
        <h2 v-if="msg>=60&msg<75">张三成绩及格</h2>
        <h2 v-if="msg<90&msg>=75">张三成绩良好</h2>
        <h2 v-if="msg>=90&msg<=100">张三成绩优秀</h2>
    </div>

    <script>
        var v = new Vue({
            el:"#f",

            data:{
                msg:"0"
            },
            methods:{
            }
        })
    </script>


</body>
</html>